Add `user_id` to signup dependencies

userid.patch

diff --git a/client/lib/signup/step-actions/index.js b/client/lib/signup/step-actions/index.js
index 92f0017eed..62c0680aec 100644
--- a/client/lib/signup/step-actions/index.js
+++ b/client/lib/signup/step-actions/index.js
@@ -153,7 +153,7 @@ function getNewSiteParams( {
 	const siteSegment = getSiteTypePropertyValue( 'slug', siteType, 'id' );
 	const siteTypeTheme = getSiteTypePropertyValue( 'slug', siteType, 'theme' );
 	const selectedDesign = get( signupDependencies, 'selectedDesign', false );
-	const userId = getCurrentUserId( state );
+	const userId = signupDependencies.user_id || getCurrentUserId( state );
 
 	const shouldHideFreePlan = get( getSignupDependencyStore( state ), 'shouldHideFreePlan', false );
 	const useAutoGeneratedBlogName = shouldHideFreePlan;
@@ -683,6 +683,7 @@ export function createAccount(
 			username,
 			marketing_price_group,
 			plans_reorder_abtest_variation,
+			user_id: userId,
 			...bearerToken,
 		};
 
diff --git a/client/signup/config/steps-pure.js b/client/signup/config/steps-pure.js
index dda165c376..94b48bd285 100644
--- a/client/signup/config/steps-pure.js
+++ b/client/signup/config/steps-pure.js
@@ -141,6 +141,7 @@ export function generateSteps( {
 				'marketing_price_group',
 				'plans_reorder_abtest_variation',
 				'redirect',
+				'user_id',
 			],
 			optionalDependencies: [ 'plans_reorder_abtest_variation', 'redirect' ],
 			props: {
@@ -160,6 +161,7 @@ export function generateSteps( {
 				'marketing_price_group',
 				'plans_reorder_abtest_variation',
 				'allowUnauthenticated',
+				'user_id',
 			],
 			optionalDependencies: [
 				'bearer_token',
@@ -167,6 +169,7 @@ export function generateSteps( {
 				'marketing_price_group',
 				'plans_reorder_abtest_variation',
 				'allowUnauthenticated',
+				'user_id',
 			],
 			props: {
 				isSocialSignupEnabled: config.isEnabled( 'signup/social' ),
@@ -403,6 +406,7 @@ export function generateSteps( {
 				'oauth2_redirect',
 				'marketing_price_group',
 				'plans_reorder_abtest_variation',
+				'user_id',
 			],
 			optionalDependencies: [ 'plans_reorder_abtest_variation' ],
 		},
@@ -418,6 +422,7 @@ export function generateSteps( {
 				'oauth2_redirect',
 				'marketing_price_group',
 				'plans_reorder_abtest_variation',
+				'user_id',
 			],
 			optionalDependencies: [ 'plans_reorder_abtest_variation' ],
 			props: {